TS1550 Delete backup on external HD?

I have a LaCie 2d external Hard Drive to which I have been backing up. Can I just delete or drag to trash old (2008) back ups? (I have been getting disk error massages and my photo files are not being saved correctly. I think HD may be maxed out.) I have all my important LARGE files on the external HD. I don't want to back up my external HD by buying yet another external HD! I have been getting disc error messages.

Thanks but I tried this and no longer am able to open my files. It suggests I copy them and reformat the drive. My LaCie external HD does not mount unless I restart. It shows my files, but I am unable to open them. Could it be a power cord? I've seen some mention HD not mounting because of power cord problems. I don't know how to copy the files from the external HD to a new HD if it's the problem with the whole HD.

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